2 * sleep.c - x86-specific ACPI sleep support.
4 * Copyright (C) 2001-2003 Patrick Mochel
5 * Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
8 #include <linux/acpi.h>
9 #include <linux/bootmem.h>
10 #include <linux/memblock.h>
11 #include <linux/dmi.h>
12 #include <linux/cpumask.h>
13 #include <asm/segment.h>
16 #include "realmode/wakeup.h"
19 unsigned long acpi_wakeup_address;
20 unsigned long acpi_realmode_flags;
22 /* address in low memory of the wakeup routine. */
23 static unsigned long acpi_realmode;
25 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
26 static char temp_stack[4096];
30 * acpi_save_state_mem - save kernel state
32 * Create an identity mapped page table and copy the wakeup routine to
35 * Note that this is too late to change acpi_wakeup_address.
37 int acpi_save_state_mem(void)
39 struct wakeup_header *header;
42 printk(KERN_ERR "Could not allocate memory during boot, "
46 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
48 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
49 if (header->signature != 0x51ee1111) {
50 printk(KERN_ERR "wakeup header does not match\n");
54 header->video_mode = saved_video_mode;
56 header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
59 * Set up the wakeup GDT. We set these up as Big Real Mode,
60 * that is, with limits set to 4 GB. At least the Lenovo
61 * Thinkpad X61 is known to need this for the video BIOS
62 * initialization quirk to work; this is likely to also
63 * be the case for other laptops or integrated video devices.
66 /* GDT[0]: GDT self-pointer */
67 header->wakeup_gdt[0] =
68 (u64)(sizeof(header->wakeup_gdt) - 1) +
69 ((u64)(acpi_wakeup_address +
70 ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
72 /* GDT[1]: big real mode-like code segment */
73 header->wakeup_gdt[1] =
74 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
75 /* GDT[2]: big real mode-like data segment */
76 header->wakeup_gdt[2] =
77 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
80 store_gdt((struct desc_ptr *)&header->pmode_gdt);
82 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
83 &header->pmode_efer_high))
84 header->pmode_efer_low = header->pmode_efer_high = 0;
85 #endif /* !CONFIG_64BIT */
87 header->pmode_cr0 = read_cr0();
88 header->pmode_cr4 = read_cr4_safe();
89 header->realmode_flags = acpi_realmode_flags;
90 header->real_magic = 0x12345678;
93 header->pmode_entry = (u32)&wakeup_pmode_return;
94 header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
95 saved_magic = 0x12345678;
96 #else /* CONFIG_64BIT */
97 header->trampoline_segment = setup_trampoline() >> 4;
99 stack_start.sp = temp_stack + sizeof(temp_stack);
100 early_gdt_descr.address =
101 (unsigned long)get_cpu_gdt_table(smp_processor_id());
102 initial_gs = per_cpu_offset(smp_processor_id());
104 initial_code = (unsigned long)wakeup_long64;
105 saved_magic = 0x123456789abcdef0L;
106 #endif /* CONFIG_64BIT */
112 * acpi_restore_state - undo effects of acpi_save_state_mem
114 void acpi_restore_state_mem(void)
120 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
122 * We allocate a page from the first 1MB of memory for the wakeup
123 * routine for when we come back from a sleep state. The
124 * runtime allocator allows specification of <16MB pages, but not
127 void __init acpi_reserve_wakeup_memory(void)
131 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
133 "ACPI: Wakeup code way too big, S3 disabled.\n");
137 mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
139 if (mem == MEMBLOCK_ERROR) {
140 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
143 acpi_realmode = (unsigned long) phys_to_virt(mem);
144 acpi_wakeup_address = mem;
145 memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
149 static int __init acpi_sleep_setup(char *str)
151 while ((str != NULL) && (*str != '\0')) {
152 if (strncmp(str, "s3_bios", 7) == 0)
153 acpi_realmode_flags |= 1;
154 if (strncmp(str, "s3_mode", 7) == 0)
155 acpi_realmode_flags |= 2;
156 if (strncmp(str, "s3_beep", 7) == 0)
157 acpi_realmode_flags |= 4;
158 #ifdef CONFIG_HIBERNATION
159 if (strncmp(str, "s4_nohwsig", 10) == 0)
160 acpi_no_s4_hw_signature();
161 if (strncmp(str, "s4_nonvs", 8) == 0) {
162 pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
163 "please use acpi_sleep=nonvs instead");
167 if (strncmp(str, "nonvs", 5) == 0)
169 if (strncmp(str, "old_ordering", 12) == 0)
170 acpi_old_suspend_ordering();
171 str = strchr(str, ',');
173 str += strspn(str, ", \t");
178 __setup("acpi_sleep=", acpi_sleep_setup);